• Title/Summary/Keyword: Decoupling of Signals

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Development of $^1H-^{31}P$ Animal RF Coil for pH Measurement Using a Clinical MR Scanner (임상용 MR에서 pH 측정을 위한 동물 실험용 $^1H-^{31}P$ RF 코일 개발)

  • Kim, Eun Ju;Kim, Daehong;Lee, Sangwoo;Heo, Dan;Lee, Young Han;Suh, Jin-Suck
    • Investigative Magnetic Resonance Imaging
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    • v.18 no.1
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    • pp.52-58
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    • 2014
  • Purpose : To establish a pH measurement system for a mouse tumor study using a clinical scanner, to develop the $^1H$ and 31P radio frequency (RF) coil system and to test pH accuracy with phantoms. Materials and Methods: The $^1H$ and the $^{31}P$ surface coils were designed to acquire signals from mouse tumors. Two coils were positioned orthogonally for geometric decoupling. The pH values of various pH phantoms were calculated using the $^1H$ decoupled $^{31}P$ MR spectrum with the Henderson-Hasselbalch equation. The calculated pH value was compared to that of a pH meter. Results: The mutual coil coupling was shown in a standard $S_{12}$. Coil coupling ($S_{12}$) were -73.0 and -62.3 dB respectively. The signal-to-noise ratio (SNR) obtained from the homogeneous phantom $^1H$ image was greater than 300. The high resolution in vivo mice images were acquired using a $^{31}P$-decoupled $^1H$ coil. The pH values calculated from the $^1H$-decoupled $^{31}P$ spectrum correlated well with the values measured by pH meter ($R^2$=0.97). Conclusion: Accurate pH values can be acquired using a $^1H$-decoupled $^{31}P$ RF coil with a clinical scanner. This two-surface coil system could be applied to other nuclear MRS or MRI.